Can Big Stocks Follow Small Stocks Higher?

Small-caps have led the market rally even while big stocks have lagged, and Apple has dropped 38.2% to a key support level.

There are several markers we usually see in a healthy stock market, and one of them is leadership by small-capitalization stocks. Bulls can check that one off as the Russell 2000 is up nearly 4% this year, and is now trading in all-time high territory.

But leaders must have followers, and right now big-cap stocks are struggling. This group now holds the key to the market's next sustained move.